Automotive Black Technology Chapter 627: : Designed for off-road use!
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After undergoing these changes, the Q5 has greatly improved its originally poor off-road performance with only a small increase in cost.
The third protagonist of this intensive launch, the Land Cruiser, has also received some minor adjustments.
What Li Fanyu redeemed in the system model database was originally the latest 16 model in the time and space before the historical process changed.
According to the Rabbit data package, the engines this model is equipped with are a 4.0-liter naturally aspirated engine code-named 1GR, a 2.7-liter naturally aspirated engine code-named 2TR, and a 3.0-liter diesel engine code-named D4D.
According to popular saying, the model names of Prado 2700, 4000 and 3000 are measured and defined based on this engine displacement.
To be honest, the performance of these three engines is very good.
While ensuring the stability of the engine, it also takes into account a certain degree of performance. When the Japanese develop the concept of off-road vehicles, the first priority is stability, followed by the pursuit of performance.
So the two gasoline engines that came out earlier sacrificed a certain amount of performance in order to ensure stability. In terms of power performance, it is not an exaggeration to call it quite satisfactory.
In other words, these R&D teams of Zhengxin all have a strong R&D style. In order to make great progress in Zhengxin's technical reserves and design capabilities, Li Fanyu will not require each R&D team to strictly follow the data packages and drawings he gave for every development of Zhengxin, but will leave them with a very Big room for play.
It is this kind of relaxed R&D environment that makes every model of Zhengxin have more or less changes compared to the initial design.
As Zhengxin’s technical reserves gradually increase, the R&D team becomes more and more mature. These changes are getting bigger and bigger, and according to the different research and development styles and personalities of the team leaders, they have been imprinted with many personal styles.
For example, Liu Qing is very radical in terms of personality and behavior.
In the process of developing the Land Cruiser, we thought that the performance of these two gasoline engines was really average, and a new power system was specially designed. During the production process, the power company also needed to set up a separate production line. It has a relatively large impact on the cost of the entire vehicle and the off-line time.
So, this guy, his team engineers and the power company combined their efforts and simply changed the engine part.
In the gasoline-powered version, the latest V6 engine installed on the F150 low-end version is implanted. This new V6 engine was actually developed by little Culbo relying on V8. A layout made to further lower the price threshold of F150.
Although this V6 engine is a transverse platform, this is not a problem for Liu Qing. With the team, we straightened the transverse platform engine and installed the modified V6 engine on the longitudinal platform of the Land Cruiser.
Because according to Li Fanyu's requirements, the Land Cruiser must have two gasoline-powered versions to maintain sales, and a diesel-powered version as a strategic layout.
So, Liu Qing made two adjustments to the V6 engine, subdividing it into high and low performance versions.
But he did not dare to touch the D4D3.0T turbocharged diesel engine.
In this development, the two high- and low-power versions of the TDI engine have taken the lead in the diesel versions of Tiguan and Q5. But when it comes to a pure off-road vehicle like the Land Cruiser, the power of this engine is still not enough.
It's not that he doesn't want to move, because the Land Cruiser has little relationship with Zhengshin's existing car series. Although it shares the same platform technology with the Fighter, it is a pickup truck and an off-road vehicle, but there are still many differences in various aspects of structure. Such a situation puts a lot of pressure on Liu Qing.
But after starting the research and development, Liu Qing suggested that Li Fanyu not use the three engines on the design drawings, but rely on the existing engines in the Zhengxin product line to implant new engines. But I received clear instructions from Li Fanyu - you can change the gasoline version, and you can try the diesel version.
……
Liu Qing didn’t know that in the time and space before the course of automobile history changed, the D4D diesel engine was also a new innovation of Toyota. It is a top-notch off-road heart specially developed by this world-class car company for its off-road models.
In fact, D4D is not the real name of this engine. According to Toyota's naming method, it should be 1VD-FTV.
But Li Fanyu feels that D4D can better highlight the special properties of this engine.
Because the full name of D4D is DirectInjection4StrokeDieselEngine, which is a high-pressure common rail direct injection four-stroke engine.
Based on this naming, we can see the technical characteristics of this engine.
The principle of high-pressure common rail direct injection is, to put it bluntly, a bit similar to the multi-point direct injection of a car. That is to install four injectors corresponding to four cylinders on a common rail, and then inject oil to the common rail through an oil pump. The opening and closing of the injector is controlled by a computer. It uses a closed-loop system composed of a high-pressure oil pump, a pressure sensor and an ECU to completely separate the generation of injection pressure and the injection process.
Because the high-pressure oil pump delivers high-pressure fuel to the public oil supply pipe, and precisely controls the oil pressure in the public oil supply pipe, the diesel engine oil supply pressure changes with the engine speed, thus reducing the noise of traditional diesel engines. A big tremor flaw.
On this basis, the D4D engine uses a highly accurate electromagnetic fuel injection valve and is equipped with an electronic oil pump that is different from the traditional diesel engine mechanical oil pump. These two good friends combine to achieve precise fuel supply control and the upper electronic pump to generate high-pressure fuel injection pressure. Combined with the strong vortex generated by the concave bowl-shaped fuel injector inside the engine, the mist diesel can be fully mixed with the air, which not only reduces the probability of knocking, but also enhances the combustion ratio in the cylinder.
It is the adoption of this comprehensive technology that fundamentally reduces the vibration and noise of diesel engines. This makes D4D 30% more fuel efficient than a gasoline engine of the same displacement, but the noise and vibration are not much different from those of a gasoline engine.
It can be said that this engine is an important trump card for Toyota in order to enter the luxury class off-road vehicle.
Li Fanyu knew this was a good thing. This D4D series engine was installed in three high-end off-road models of Toyota in the time and space before the course of automobile history changed. This big guy can be seen on the Prado, Land Cruiser LC and Lexus LX.
Since he wants to make an off-road vehicle, of course Li Fanyu cannot let go of this off-road vehicle!
This is the main part of the engine.
As for the gearbox, the original manual and automatic gearboxes used by Prado are old-fashioned, but they are more stable and resistant to roughness.
In order to ensure the stability and off-road performance of the vehicle, Liu Qing was too lazy to change it. After all, the Land Cruiser is to be integrated into the Volkswagen brand to complement the product line, and Volkswagen's positioning lies there. It is not impossible to equip this car with an 8AT transmission, but something that is too high-end will inevitably increase the cost.
That's not a mistake, so I'll stick with it.
In terms of off-road configuration, the Land Cruiser’s configuration is definitely a killer;
Needless to say, the high-strength non-load-bearing off-road chassis is in the same line as the Fighter. It is a continuation of the platform. In the differential lock, compared with SUV models, the excellence of the Land Cruiser is reflected.
Because the Q5 is an SUV, the differential lock can use a low-cost tooth-type differential lock. Because after all, the main battlefield for SUVs is in cities, and off-road performance is a must, but it is not a specialty.
But the Land Cruiser is different. This is a model specially designed for off-road use.
This means that the tooth-mounted differential cannot be used and must be switched manually, but it is suspected of being a mess. Therefore, the Land Cruiser is equipped with a Torsen-type self-locking differential that is relatively complex but can maximize vehicle passability.
This thing actually uses five sets of worm gears to integrate the differential and differential lock. Utilizing the irreversibility principle of worm gear transmission and tooth surface friction, the differential automatically locks or unlocks according to the amount of internal friction torque.
This is fully automatic and can automatically adjust according to the rotation of the half shaft, improving the throughput capacity in all directions.
In addition, it is also equipped with a low-speed four-wheel drive function, which uses an afterburner box to nearly triple the torque when running on bad roads at low speeds, improving hill climbing or driving without damaging the gearbox. Ability to get out of trouble.
In a word, almost all the configurations on the Land Cruiser are prepared for off-road use. All kinds of configurations added together create such a domineering off-road vehicle.
The completion of the research and development of the Land Cruiser also completely declares the completion of this round of research and development work.
After months of arduous research and development, the Tiguan, Q5, and Land Cruiser, three models with different and even different performances, have finally passed the incubation stage and entered the stage of launch!